[PATCH v2] gdb/README: Refactor where build requirements are explained

[Guinevere Larsen <guinevere@redhat.com>]

User la_mettrie on IRC mentioned that they were having difficulties
building GDB, and after some debugging, we figured out that they weren't
using GNU Make. This is in the final documentation, but considering that
it is not an obvious place to look, and the README mentions other build
requirements, so this seems like a pretty obvious oversight.

This commit also shortens the entire paragraph that explains the build
requirements, and moves it closer to the start of the install
requirements, so that they are less likely to be missed by users.
---
 gdb/README | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/gdb/README b/gdb/README
index 492b0891668..8dc50667212 100644
--- a/gdb/README
+++ b/gdb/README
@@ -28,6 +28,10 @@ Configuration scripts and makefiles exist to cruise up and down this
 directory tree and automatically build all the pieces in the right
 order.
 
+   GDB requires a C++17 compiler, an ISO C standard library and GNU
+Make.  The GDB remote server, GDBserver, builds with some non-ISO
+standard libraries - e.g. for Windows CE.
+
    When you unpack the gdb-VERSION.tar.gz file, it will create a
 source directory called `gdb-VERSION'.
 
@@ -82,13 +86,6 @@ list of options, invoke the subdirectory `configure', like:
    (Take note of how this differs from the invocation used to actually
 configure the build tree.)
 
-   GDB requires a C++17 compiler.  If you do not have a
-C++17 compiler for your system, you may be able to download and install
-the GNU CC compiler.  It is available via anonymous FTP from the
-directory `ftp://ftp.gnu.org/pub/gnu/gcc'.  GDB also requires an ISO
-C standard library.  The GDB remote server, GDBserver, builds with some
-non-ISO standard libraries - e.g. for Windows CE.
-
    GDB can optionally be built against various external libraries.
 These dependencies are described below in the "`configure options"
 section of this README.

base-commit: e4fe38115fea0a9f357527959893f18ca8d51a03
-- 
2.53.0