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[WebAssembly] Enable -ffunction-sections and -fdata-sections by default. 

These remain user-overridable with -fno-function-sections and
-fno-data-sections.

llvm-svn: 257005
This commit is contained in:
Dan Gohman 2016-01-07 00:50:27 +00:00
parent 4e480206b2
commit a5b804be61
2 changed files with 21 additions and 4 deletions
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11
clang/lib/Driver/Tools.cpp
View File

@ -4176,8 +4176,11 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back("-generate-type-units");
}
// CloudABI uses -ffunction-sections and -fdata-sections by default.
bool UseSeparateSections = Triple.getOS() == llvm::Triple::CloudABI;
// CloudABI and WebAssembly use -ffunction-sections and -fdata-sections by
// default.
bool UseSeparateSections = Triple.getOS() == llvm::Triple::CloudABI ||
Triple.getArch() == llvm::Triple::wasm32 ||
Triple.getArch() == llvm::Triple::wasm64;
if (Args.hasFlag(options::OPT_ffunction_sections,
options::OPT_fno_function_sections, UseSeparateSections)) {
@ -6536,7 +6539,9 @@ void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
CmdArgs.push_back("ld");
// Enable garbage collection of unused input sections by default, since code
// size is of particular importance.
// size is of particular importance. This is significantly facilitated by
// the enabling of -ffunction-sections and -fdata-sections in
// Clang::ConstructJob.
if (areOptimizationsEnabled(Args))
CmdArgs.push_back("--gc-sections");

14
clang/test/Driver/wasm-toolchain.c
View File

@ -1,7 +1,19 @@
// A basic clang -cc1 command-line.
// RUN: %clang %s -### -target wasm32-unknown-unknown 2>&1 | FileCheck -check-prefix=CC1 %s
// CC1: clang{{.*}} "-cc1" "-triple" "wasm32-unknown-unknown" {{.*}}
// CC1: clang{{.*}} "-cc1" "-triple" "wasm32-unknown-unknown" {{.*}} "-ffunction-sections" "-fdata-sections"
// Ditto, but ensure that a user -fno-function-sections disables the
// default -ffunction-sections.
// RUN: %clang %s -### -target wasm32-unknown-unknown -fno-function-sections 2>&1 | FileCheck -check-prefix=NO_FUNCTION_SECTIONS %s
// NO_FUNCTION_SECTIONS-NOT: function-sections
// Ditto, but ensure that a user -fno-data-sections disables the
// default -fdata-sections.
// RUN: %clang %s -### -target wasm32-unknown-unknown -fno-data-sections 2>&1 | FileCheck -check-prefix=NO_DATA_SECTIONS %s
// NO_DATA_SECTIONS-NOT: data-sections
// A basic C link command-line.