[PATCH] D106854: Pass `--start-group` and `--end-group` to the linker when using the AVR toolchain

[Matt Jacobson via Phabricator via cfe-commits]

mhjacobson updated this revision to Diff 362275.
mhjacobson added a comment.

Updated the diff to add more context.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106854/new/

https://reviews.llvm.org/D106854

Files:
  clang/lib/Driver/ToolChains/AVR.cpp
  clang/test/Driver/avr-ld.c


Index: clang/test/Driver/avr-ld.c
===================================================================
--- clang/test/Driver/avr-ld.c
+++ clang/test/Driver/avr-ld.c
@@ -1,44 +1,44 @@
 // RUN: %clang -### --target=avr -mmcu=at90s2313 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKA %s
-// LINKA: {{".*ld.*"}} {{.*}} {{"-L.*tiny-stack"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lat90s2313" "-mavr2"
+// LINKA: {{".*ld.*"}} {{.*}} {{"-L.*tiny-stack"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lat90s2313" {{.*}} "-mavr2"
 
 // RUN: %clang -### --target=avr -mmcu=at90s8515 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKB %s
-// LINKB: {{".*ld.*"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lat90s8515" "-mavr2"
+// LINKB: {{".*ld.*"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lat90s8515" {{.*}} "-mavr2"
 
 // RUN: %clang -### --target=avr -mmcu=attiny13 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKC %s
-// LINKC: {{".*ld.*"}} {{.*}} {{"-L.*avr25/tiny-stack"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lattiny13" "-mavr25"
+// LINKC: {{".*ld.*"}} {{.*}} {{"-L.*avr25/tiny-stack"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lattiny13" {{.*}} "-mavr25"
 
 // RUN: %clang -### --target=avr -mmcu=attiny44 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKD %s
-// LINKD: {{".*ld.*"}} {{.*}} {{"-L.*avr25"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lattiny44" "-mavr25"
+// LINKD: {{".*ld.*"}} {{.*}} {{"-L.*avr25"}} {{.*}} "-Tdata=0x800060" {{.*}} "-lattiny44" {{.*}} "-mavr25"
 
 // RUN: %clang -### --target=avr -mmcu=atmega103 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKE %s
-// LINKE: {{".*ld.*"}} {{.*}} {{"-L.*avr31"}} {{.*}} "-Tdata=0x800060" {{.*}} "-latmega103" "-mavr31"
+// LINKE: {{".*ld.*"}} {{.*}} {{"-L.*avr31"}} {{.*}} "-Tdata=0x800060" {{.*}} "-latmega103" {{.*}} "-mavr31"
 
 // RUN: %clang -### --target=avr -mmcu=atmega8u2 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKF %s
-// LINKF: {{".*ld.*"}} {{.*}} {{"-L.*avr35"}} {{.*}} "-Tdata=0x800100" {{.*}} "-latmega8u2" "-mavr35"
+// LINKF: {{".*ld.*"}} {{.*}} {{"-L.*avr35"}} {{.*}} "-Tdata=0x800100" {{.*}} "-latmega8u2" {{.*}} "-mavr35"
 
 // RUN: %clang -### --target=avr -mmcu=atmega48pa --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKG %s
-// LINKG: {{".*ld.*"}} {{.*}} {{"-L.*avr4"}} {{.*}} "-Tdata=0x800100" {{.*}} "-latmega48pa" "-mavr4"
+// LINKG: {{".*ld.*"}} {{.*}} {{"-L.*avr4"}} {{.*}} "-Tdata=0x800100" {{.*}} "-latmega48pa" {{.*}} "-mavr4"
 
 // RUN: %clang -### --target=avr -mmcu=atmega328 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKH %s
-// LINKH: {{".*ld.*"}} {{.*}} {{"-L.*avr5"}} {{.*}} "-Tdata=0x800100" {{.*}} "-latmega328" "-mavr5"
+// LINKH: {{".*ld.*"}} {{.*}} {{"-L.*avr5"}} {{.*}} "-Tdata=0x800100" {{.*}} "-latmega328" {{.*}} "-mavr5"
 
 // RUN: %clang -### --target=avr -mmcu=atmega1281 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKI %s
-// LINKI: {{".*ld.*"}} {{.*}} {{"-L.*avr51"}} {{.*}} "-Tdata=0x800200" {{.*}} "-latmega1281" "-mavr51"
+// LINKI: {{".*ld.*"}} {{.*}} {{"-L.*avr51"}} {{.*}} "-Tdata=0x800200" {{.*}} "-latmega1281" {{.*}} "-mavr51"
 
 // RUN: %clang -### --target=avr -mmcu=atmega2560 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKJ %s
-// LINKJ: {{".*ld.*"}} {{.*}} {{"-L.*avr6"}} {{.*}} "-Tdata=0x800200" {{.*}} "-latmega2560" "-mavr6"
+// LINKJ: {{".*ld.*"}} {{.*}} {{"-L.*avr6"}} {{.*}} "-Tdata=0x800200" {{.*}} "-latmega2560" {{.*}} "-mavr6"
 
 // RUN: %clang -### --target=avr -mmcu=attiny10 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKK %s
-// LINKK: {{".*ld.*"}} {{.*}} {{"-L.*avrtiny"}} {{.*}} "-Tdata=0x800040" {{.*}} "-lattiny10" "-mavrtiny"
+// LINKK: {{".*ld.*"}} {{.*}} {{"-L.*avrtiny"}} {{.*}} "-Tdata=0x800040" {{.*}} "-lattiny10" {{.*}} "-mavrtiny"
 
 // RUN: %clang -### --target=avr -mmcu=atxmega16a4 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKL %s
-// LINKL: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega2"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega16a4" "-mavrxmega2"
+// LINKL: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega2"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega16a4" {{.*}} "-mavrxmega2"
 
 // RUN: %clang -### --target=avr -mmcu=atxmega64b3 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKM %s
-// LINKM: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega4"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega64b3" "-mavrxmega4"
+// LINKM: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega4"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega64b3" {{.*}} "-mavrxmega4"
 
 // RUN: %clang -### --target=avr -mmcu=atxmega128a3u --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKN %s
-// LINKN: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega6"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega128a3u" "-mavrxmega6"
+// LINKN: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega6"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega128a3u" {{.*}} "-mavrxmega6"
 
 // RUN: %clang -### --target=avr -mmcu=atxmega128a1 --sysroot %S/Inputs/basic_avr_tree %s 2>&1 | FileCheck -check-prefix LINKO %s
-// LINKO: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega7"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega128a1" "-mavrxmega7"
+// LINKO: {{".*ld.*"}} {{.*}} {{"-L.*avrxmega7"}} {{.*}} "-Tdata=0x802000" {{.*}} "-latxmega128a1" {{.*}} "-mavrxmega7"
Index: clang/lib/Driver/ToolChains/AVR.cpp
===================================================================
--- clang/lib/Driver/ToolChains/AVR.cpp
+++ clang/lib/Driver/ToolChains/AVR.cpp
@@ -414,6 +414,8 @@
   if (LinkStdlib) {
     assert(!CPU.empty() && "CPU name must be known in order to link stdlibs");
 
+    CmdArgs.push_back("--start-group");
+
     // Add the object file for the CRT.
     std::string CrtFileName = std::string("-l:crt") + CPU + std::string(".o");
     CmdArgs.push_back(Args.MakeArgString(CrtFileName));
@@ -425,6 +427,8 @@
     // Add the link library specific to the MCU.
     CmdArgs.push_back(Args.MakeArgString(std::string("-l") + CPU));
 
+    CmdArgs.push_back("--end-group");
+
     // Specify the family name as the emulation mode to use.
     // This is almost always required because otherwise avr-ld
     // will assume 'avr2' and warn about the program being larger


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