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authorLudovic Courtès <ludo@gnu.org>2015-06-19 17:18:03 +0200
committerLudovic Courtès <ludo@gnu.org>2015-06-19 17:23:48 +0200
commitfd6ae1b9836ffe74105f26930d101d1297849740 (patch)
tree16c1a0ba29c5a5883b88f186148ecefc3f91c7af /gnu/packages
parentef11ac87013a67f2c4454adf7d477a5c602a14b3 (diff)
gnu: clang: Allow 'clang' to link executables.
* gnu/packages/patches/clang-libc-search-path.patch: New file. * gnu-system.am (dist_patch_DATA): Add it. * gnu/packages/llvm.scm (clang-from-llvm)[source]: Use it. [inputs]: Add "gcc-lib". [arguments]. Add -DGCC_INSTALL_PREFIX and -DC_INCLUDE_DIRS to #:configure-flags. Add #:phases argument.
Diffstat (limited to 'gnu/packages')
-rw-r--r--gnu/packages/llvm.scm37
-rw-r--r--gnu/packages/patches/clang-libc-search-path.patch19
2 files changed, 54 insertions, 2 deletions
diff --git a/gnu/packages/llvm.scm b/gnu/packages/llvm.scm
index 946773c91e..1755f9c014 100644
--- a/gnu/packages/llvm.scm
+++ b/gnu/packages/llvm.scm
@@ -26,6 +26,8 @@
#:use-module (guix build-system gnu)
#:use-module (guix build-system cmake)
#:use-module (gnu packages)
+ #:use-module (gnu packages gcc)
+ #:use-module (gnu packages bootstrap) ;glibc-dynamic-linker
#:use-module (gnu packages perl)
#:use-module (gnu packages python)
#:use-module (gnu packages xml))
@@ -85,7 +87,8 @@ tools as well as libraries with equivalent functionality.")
(method url-fetch)
(uri (string-append "http://llvm.org/releases/"
version "/cfe-" version ".src.tar.xz"))
- (sha256 (base32 hash))))
+ (sha256 (base32 hash))
+ (patches (list (search-patch "clang-libc-search-path.patch")))))
;; Using cmake allows us to treat llvm as an external library. There
;; doesn't seem to be any way to do this with clang's autotools-based
;; build system.
@@ -93,10 +96,40 @@ tools as well as libraries with equivalent functionality.")
(native-inputs (package-native-inputs llvm))
(inputs
`(("libxml2" ,libxml2)
+ ("gcc-lib" ,gcc-4.9 "lib")
,@(package-inputs llvm)))
(propagated-inputs
`(("llvm" ,llvm)))
- (arguments `(#:configure-flags '("-DCLANG_INCLUDE_TESTS=True")))
+ (arguments
+ `(#:configure-flags
+ (list "-DCLANG_INCLUDE_TESTS=True"
+
+ ;; Find libgcc_s, crtbegin.o, and crtend.o.
+ (string-append "-DGCC_INSTALL_PREFIX="
+ (assoc-ref %build-inputs "gcc-lib"))
+
+ ;; Use a sane default include directory.
+ (string-append "-DC_INCLUDE_DIRS="
+ (assoc-ref %build-inputs "libc")
+ "/include"))
+
+ #:phases (modify-phases %standard-phases
+ (add-after
+ 'unpack 'set-glibc-file-names
+ (lambda* (#:key inputs #:allow-other-keys)
+ (let ((libc (assoc-ref inputs "libc")))
+ ;; Patch the 'getLinuxDynamicLinker' function to that
+ ;; it uses the right dynamic linker file name.
+ (substitute* "lib/Driver/Tools.cpp"
+ (("/lib64/ld-linux-x86-64.so.2")
+ (string-append libc
+ ,(glibc-dynamic-linker))))
+
+ ;; Same for libc's libdir, to allow crt1.o & co. to be
+ ;; found.
+ (substitute* "lib/Driver/ToolChains.cpp"
+ (("@GLIBC_LIBDIR@")
+ (string-append libc "/lib")))))))))
;; Clang supports the same environment variables as GCC.
(native-search-paths
diff --git a/gnu/packages/patches/clang-libc-search-path.patch b/gnu/packages/patches/clang-libc-search-path.patch
new file mode 100644
index 0000000000..327336ac09
--- /dev/null
+++ b/gnu/packages/patches/clang-libc-search-path.patch
@@ -0,0 +1,19 @@
+Clang attempts to guess file names based on the OS and distro (yes!),
+but unfortunately, that doesn't work for us.
+
+This patch makes it easy to insert libc's $libdir so that Clang passes the
+correct absolute file name of crt1.o etc. to 'ld'.
+
+--- cfe-3.6.0.src/lib/Driver/ToolChains.cpp 2015-02-18 22:03:07.000000000 +0100
++++ cfe-3.6.0.src/lib/Driver/ToolChains.cpp 2015-06-19 16:37:20.459701044 +0200
+@@ -3085,6 +3085,10 @@ Linux::Linux(const Driver &D, const llvm
+
+ addPathIfExists(SysRoot + "/lib", Paths);
+ addPathIfExists(SysRoot + "/usr/lib", Paths);
++
++ // Add libc's lib/ directory to the search path, so that crt1.o, crti.o,
++ // and friends can be found.
++ addPathIfExists("@GLIBC_LIBDIR@", Paths);
+ }
+
+ bool Linux::HasNativeLLVMSupport() const {