[flang-commits] [clang] [flang] [FLANG][Driver] Support -fno-profile-generate and -fprofile-generate=<dir> in flang (PR #216643)
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Sun Aug 16 23:12:58 PDT 2026
llvmorg-github-actions[bot] wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-driver
Author: Kaviya Rajendiran (kaviya2510)
<details>
<summary>Changes</summary>
Added support for PGO options `-fno-profile-generate` and `-fno-profile-generate` in flang.
---
Full diff: https://github.com/llvm/llvm-project/pull/216643.diff
5 Files Affected:
- (modified) clang/include/clang/Options/Options.td (+2-2)
- (modified) clang/lib/Driver/ToolChains/Flang.cpp (+9-3)
- (modified) flang/lib/Frontend/CompilerInvocation.cpp (+12-2)
- (modified) flang/test/Driver/flang-f-opts.f90 (+12)
- (modified) flang/test/Profile/gcc-flag-compatibility.f90 (+6)
``````````diff
diff --git a/clang/include/clang/Options/Options.td b/clang/include/clang/Options/Options.td
index adc4224dd561c..b1c188d6452f3 100644
--- a/clang/include/clang/Options/Options.td
+++ b/clang/include/clang/Options/Options.td
@@ -1954,7 +1954,7 @@ def fprofile_generate : Flag<["-"], "fprofile-generate">,
Group<f_Group>, Visibility<[ClangOption, CLOption, FlangOption, FC1Option]>,
HelpText<"Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM_PROFILE_FILE env var)">;
def fprofile_generate_EQ : Joined<["-"], "fprofile-generate=">,
- Group<f_Group>, Visibility<[ClangOption, CLOption]>,
+ Group<f_Group>, Visibility<[ClangOption, CLOption, FlangOption, FC1Option]>,
MetaVarName<"<directory>">,
HelpText<"Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)">;
def fcs_profile_generate : Flag<["-"], "fcs-profile-generate">,
@@ -1975,7 +1975,7 @@ def fno_profile_instr_generate : Flag<["-"], "fno-profile-instr-generate">,
Group<f_Group>, Visibility<[ClangOption, CLOption]>,
HelpText<"Disable generation of profile instrumentation.">;
def fno_profile_generate : Flag<["-"], "fno-profile-generate">,
- Group<f_Group>, Visibility<[ClangOption, CLOption]>,
+ Group<f_Group>, Visibility<[ClangOption, CLOption, FlangOption, FC1Option]>,
HelpText<"Disable generation of profile instrumentation.">;
def fno_profile_instr_use : Flag<["-"], "fno-profile-instr-use">,
Group<f_Group>, Visibility<[ClangOption, CLOption]>,
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index a48e41159f367..d0545b57bb7fe 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -1233,6 +1233,13 @@ static void addPGOAndCoverageFlags(const ToolChain &TC, const JobAction &JA,
if (Args.hasFlag(options::OPT_fpseudo_probe_for_profiling,
options::OPT_fno_pseudo_probe_for_profiling, false))
CmdArgs.push_back("-fpseudo-probe-for-profiling");
+
+ if (Arg *PGOGenerateArg = Args.getLastArg(
+ options::OPT_fprofile_generate, options::OPT_fprofile_generate_EQ,
+ options::OPT_fno_profile_generate)) {
+ if (!PGOGenerateArg->getOption().matches(options::OPT_fno_profile_generate))
+ PGOGenerateArg->render(Args, CmdArgs);
+ }
}
void Flang::ConstructJob(Compilation &C, const JobAction &JA,
@@ -1365,9 +1372,8 @@ void Flang::ConstructJob(Compilation &C, const JobAction &JA,
// TODO: Handle interactions between -w, -pedantic, -Wall, -WOption
Args.AddLastArg(CmdArgs, options::OPT_w);
- // recognise options: fprofile-generate -fprofile-use=
- Args.addAllArgs(
- CmdArgs, {options::OPT_fprofile_generate, options::OPT_fprofile_use_EQ});
+ // recognise options: -fprofile-use=
+ Args.addAllArgs(CmdArgs, {options::OPT_fprofile_use_EQ});
addPGOAndCoverageFlags(TC, JA, Args, CmdArgs);
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index b57bc4583be38..7753265ae413c 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -497,8 +497,18 @@ static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
opts.IsPIE = 1;
}
- if (args.hasArg(clang::options::OPT_fprofile_generate)) {
- opts.setProfileInstr(llvm::driver::ProfileInstrKind::ProfileIRInstr);
+ if (const llvm::opt::Arg *a =
+ args.getLastArg(clang::options::OPT_fprofile_generate,
+ clang::options::OPT_fprofile_generate_EQ,
+ clang::options::OPT_fno_profile_generate)) {
+ if (!a->getOption().matches(clang::options::OPT_fno_profile_generate)) {
+ opts.setProfileInstr(llvm::driver::ProfileInstrKind::ProfileIRInstr);
+ if (a->getOption().matches(clang::options::OPT_fprofile_generate_EQ)) {
+ llvm::SmallString<128> path(a->getValue());
+ llvm::sys::path::append(path, "default_%m.profraw");
+ opts.InstrProfileOutput = std::string(path);
+ }
+ }
}
if (auto A = args.getLastArg(clang::options::OPT_fprofile_use_EQ)) {
diff --git a/flang/test/Driver/flang-f-opts.f90 b/flang/test/Driver/flang-f-opts.f90
index 3f53adaf56271..def17a7b15ecf 100644
--- a/flang/test/Driver/flang-f-opts.f90
+++ b/flang/test/Driver/flang-f-opts.f90
@@ -11,6 +11,18 @@
! RUN: %flang -### -S -fprofile-generate %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-GENERATE-LLVM %s
! CHECK-PROFILE-GENERATE-LLVM: "-fprofile-generate"
+
+! RUN: rm -rf %t.pgodir && mkdir -p %t.pgodir
+! RUN: %flang -### -S -fprofile-generate=%t.pgodir %s 2>&1| FileCheck -check-prefix=CHECK-PROFILE-GENERATE-EQ %s
+! CHECK-PROFILE-GENERATE-EQ: "-fprofile-generate={{.*}}pgodir"
+
+! RUN: %flang -### -S -fprofile-generate -fno-profile-generate %s 2>&1 | FileCheck -check-prefix=CHECK-FNO-PROFILE-GENERATE %s
+! CHECK-FNO-PROFILE-GENERATE: "-fc1"
+! CHECK-FNO-PROFILE-GENERATE-NOT: "-fprofile-generate"
+
+! RUN: %flang -### -S -fno-profile-generate -fprofile-generate %s 2>&1 | FileCheck -check-prefix=CHECK-FPROFILE-GENERATE %s
+! CHECK-FPROFILE-GENERATE: "-fprofile-generate"
+
! RUN: %flang -### -S -fprofile-use=%S %s 2>&1 | FileCheck -check-prefix=CHECK-PROFILE-USE-DIR %s
! CHECK-PROFILE-USE-DIR: "-fprofile-use={{.*}}"
!
diff --git a/flang/test/Profile/gcc-flag-compatibility.f90 b/flang/test/Profile/gcc-flag-compatibility.f90
index 4490c45232d28..5040cc6b721bf 100644
--- a/flang/test/Profile/gcc-flag-compatibility.f90
+++ b/flang/test/Profile/gcc-flag-compatibility.f90
@@ -6,6 +6,12 @@
! On AIX, -flto used to be required with -fprofile-generate. gcc-flag-compatibility-aix.c is used to do the testing on AIX with -flto
! RUN: %flang %s -c -S -o - -emit-llvm -fprofile-generate | FileCheck -check-prefix=PROFILE-GEN %s
+! RUN: rm -rf %t.gendir
+! RUN: mkdir -p %t.gendir
+! RUN: %flang %s -c -S -o - -emit-llvm -fprofile-generate=%t.gendir | FileCheck -check-prefix=PROFILE-GEN %s
+! RUN: %flang_fc1 -emit-llvm -fprofile-generate -fno-profile-generate -o - %s | FileCheck -check-prefix=NO-PROFILE-GEN %s
+! RUN: %flang_fc1 -emit-llvm -fno-profile-generate -fprofile-generate -o - %s | FileCheck -check-prefix=PROFILE-GEN %s
+! NO-PROFILE-GEN-NOT: @__profc_
! PROFILE-GEN: @__profc_{{_?}}main = {{(private|internal)}} global [1 x i64] zeroinitializer, section
! PROFILE-GEN: @__profd_{{_?}}main =
``````````
</details>
https://github.com/llvm/llvm-project/pull/216643
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