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Add a tc-get-compiler-type() function that can be used to identify |
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the compiler being used, using the preprocessor defines. Alike |
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gcc-*version() routines, it uses CPP (which in turn uses CC). |
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|
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The major usage would be applying compiler-specific quirks and limiting |
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gcc version checks to compilers that actually are gcc, since e.g. clang |
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reports gcc version 4.2 -- which would incorrectly cause numerous gcc |
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version checks in ebuilds to fail. |
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--- |
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eclass/tests/toolchain-funcs.sh | 15 +++++++++++++++ |
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eclass/toolchain-funcs.eclass | 19 +++++++++++++++++++ |
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2 files changed, 34 insertions(+) |
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|
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diff --git a/eclass/tests/toolchain-funcs.sh b/eclass/tests/toolchain-funcs.sh |
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index 41c1ae5..0b9b7d7 100755 |
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--- a/eclass/tests/toolchain-funcs.sh |
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+++ b/eclass/tests/toolchain-funcs.sh |
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@@ -111,5 +111,20 @@ tc-ld-disable-gold |
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) |
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tend $? |
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|
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+tbegin "tc-get-compiler-type (gcc)" |
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+( |
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+export CC=gcc |
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+[[ $(tc-get-compiler-type) == gcc ]] |
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+) |
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+tend $? |
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+ |
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+if type -P clang &>/dev/null; then |
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+ tbegin "tc-get-compiler-type (clang)" |
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+ ( |
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+ export CC=clang |
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+ [[ $(tc-get-compiler-type) == clang ]] |
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+ ) |
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+ tend $? |
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+fi |
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|
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texit |
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diff --git a/eclass/toolchain-funcs.eclass b/eclass/toolchain-funcs.eclass |
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index 3398775..116bc43 100644 |
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--- a/eclass/toolchain-funcs.eclass |
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+++ b/eclass/toolchain-funcs.eclass |
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@@ -585,6 +585,25 @@ tc-endian() { |
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esac |
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} |
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|
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+# @FUNCTION: tc-get-compiler-type |
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+# @RETURN: keyword identifying the compiler: gcc, clang, unknown |
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+tc-get-compiler-type() { |
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+ set -- $($(tc-getCPP "$@") -E -P - <<<"CPP_WORKS __GNUC__ __clang__") |
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+ |
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+ # CPP_WORKS shouldn't be substituted -- so if it's not there, |
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+ # cpp is probably broken |
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+ if [[ $1 != CPP_WORKS ]]; then |
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+ echo unknown |
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+ # Check which of the defines were substituted |
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+ elif [[ $3 != __clang__ ]]; then |
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+ echo clang |
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+ elif [[ $2 != __GNUC__ ]]; then |
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+ echo gcc |
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+ else |
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+ echo unknown |
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+ fi |
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+} |
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+ |
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# Internal func. The first argument is the version info to expand. |
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# Query the preprocessor to improve compatibility across different |
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# compilers rather than maintaining a --version flag matrix. #335943 |
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-- |
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2.9.0 |