[haiku-development] Re: missing -lm?
- From: Grzegorz Dąbrowski <grzegorz.dabrowski@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 29 Apr 2008 08:27:56 +0000
On Mon, 28 Apr 2008 23:57:20 +0200 CEST
"François Revol" <revol@xxxxxxx> wrote:
> > One of the things I've seen come up more than once now in attempting
> > ports is that they bomb out for a missing -lm.
> > It's my understanding the this refers to libm which is a math
> > library.
> > Is this included in one of Haiku's libraries?
> > And is the workaround to include a Haiku library rather than -lm,
> > and if so which one is it?
>
> In Haiku (and BeOS), glibc and libm are both included in libroot and
> linked to by default.
> It is really wrong to assume library existence, be it libm.
> But since we are the only Unixish OS around that doesn't have it,
> linux freeks often think they can hardcode it.
> The correct fix is to check for it at configure or compile time.
> Remove the -lm from the makefiles, and you can usually add something
> like:
> AC_CHECK_LIB(m,sqrtf)
> to the configure.ac or .in.
> Sometimes you must add it to a custom FOOLIBS variable instead of
> LIBS, but most of the time it should just work this way.
>
> There is no reason we should add a hack to work around buggy software.
> AFAIK libm is not mandated by any standard.
>
> François.
>
Maybe we should add symlinks like this, what do you think?
diff --git a/build/jam/HaikuImage b/build/jam/HaikuImage
index 8e082dd..022cdc5 100644
--- a/build/jam/HaikuImage
+++ b/build/jam/HaikuImage
@@ -197,6 +197,15 @@ for lib in $(BEOS_SYSTEM_LIBS_LIBNETWORK_ALIASES) {
AddSymlinkToHaikuImage beos system lib : libnetwork.so :
$(lib) ; }
+# libroot.so replaces quite a few libraries
+BEOS_SYSTEM_LIBS_LIBROOT_ALIASES
+ = libm.so libpthread.so libdl.so ;
+
+local lib ;
+for lib in $(BEOS_SYSTEM_LIBS_LIBROOT_ALIASES) {
+ AddSymlinkToHaikuImage beos system lib : libroot.so : $(lib) ;
+}
+
# libGL.so has GLUT built-in
if $(TARGET_ARCH) = x86 {
AddSymlinkToHaikuImage beos system lib : $(X86_ONLY)libGL.so :
libglut.so ; diff --git a/build/jam/OptionalPackages
b/build/jam/OptionalPackages index d1f51fe..f9937a8 100644
--- a/build/jam/OptionalPackages
+++ b/build/jam/OptionalPackages
@@ -30,7 +30,8 @@ if [ IsOptionalHaikuImagePackageAdded Development ]
# library symlinks
local lib ;
for lib in $(BEOS_SYSTEM_LIBS)
- $(BEOS_SYSTEM_LIBS_LIBNETWORK_ALIASES) libglut.so {
+ $(BEOS_SYSTEM_LIBS_LIBNETWORK_ALIASES) libglut.so
+ $(BEOS_SYSTEM_LIBS_LIBROOT_ALIASES) {
AddSymlinkToHaikuImage develop lib
x86 : /system/lib/$(lib:BS) ; }
--
Grzegorz Dąbrowski
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